.top{
    /*background: black;*/
    text-align: right;
    font-size: 20px;
    line-height: 40px;
    background-image: linear-gradient(red, yellow, green);
    border-radius: 8px; /*设置边框的弧度*/


}
.top a{
    color: white;
}
.nav{
    line-height: 40px;
}
.left{
    width: 20%;
    text-align: center;
    float: left;

}
.left img{
    width: 28px;
    height: 38px;
}
.left span{
    vertical-align: 50%;
}
.center{
    width: 60%;
    float: left;

}
.right{
    width: 20%;
    float: left;
}
.footer{
    clear: both;
    /*background: chocolate ;*/
    line-height: 25px;
    text-align: center;
    background-image: linear-gradient(to right, red , yellow);
    border-radius: 8px; /*设置边框的弧度*/
}
.footer a{
    color: white;
}

a{
    text-decoration: none;
    color: black;
}
a:hover{
    color: red;
}